Telit Wireless Solutions GC864-QUAD Hardware User's Manual

GC864 Hardware User Guide

GC864-PY, GC864-QUAD

1vv0300733 Rev. 0 - 12/06/06

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

Contents

1 Overview ...........................................................................................................................4

2 Hardware Commands ......................................................................................................5

2.1 Turning ON the GC864 ...........................................................................................................5

2.2 Turning OFF the GC864 ........................................................................................................7

2.2.1 Hardware shutdown..........................................................................................................................7

2.3 Hardware Unconditional Reboot...........................................................................................7

3 Power Supply ...................................................................................................................9

3.1 Power Supply Requirements.................................................................................................9

3.2 General Design Rules ..........................................................................................................10

3.2.1 Electrical design Guidelines........................................................................................................... 10

3.2.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 10

3.2.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 12

3.2.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 13

3.2.1.4 Battery Charge control Circuitry Design Guidelines .................................................................. 13

3.2.2 Thermal Design Guidelines ........................................................................................................... 15

3.2.3 Power Supply PCB layout Guidelines ........................................................................................... 16

4 Antenna...........................................................................................................................17

4.1 Antenna Requirements ........................................................................................................17

4.2 GC864 Antenna Connector..................................................................................................17

4.3 Antenna installation Guidelines..........................................................................................18

5 GC864 pins allocation....................................................................................................19

NOTE: RESERVED pins must not be connected..........................................................................21

6 Serial Port .......................................................................................................................22

6.1 RS232 level translation ........................................................................................................24

6.2 5V UART level translation....................................................................................................26

7 Audio Section Overview ................................................................................................28

7.1 Microphone paths characteristic and requirements .........................................................30

7.2 General Design Rules ..........................................................................................................33

7.3 Other considerations. ..........................................................................................................33

7.4 Microphone Biasing .............................................................................................................34

7.4.1 Balanced Microphone biasing........................................................................................................ 34

7.4.2 Unbalanced Microphone biasing ...................................................................................................35

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7.5 Microphone buffering...........................................................................................................37

7.5.1 Buffered Balanced Mic................................................................................................................... 37

7.5.2 Buffered Unbalanced (Single Ended) Microphone . ...................................................................... 39

8 OUTPUT LINES (Speaker)..............................................................................................42

8.1 Short description..................................................................................................................42

8.2 Output lines characteristics . .............................................................................................43

8.3 General Design rules............................................................................................................44

8.3.1 Noise Filtering................................................................................................................................ 44

8.4 Handset earphone design....................................................................................................45

8.5 Hands-free earphone (low power) design ..........................................................................46

8.6 Car Kit speakerphone design..............................................................................................47

9 External SIM Holder .......................................................................................................48

9.1 SIM DESIGN GUIDES............................................................................................................48

10 General Purpose I/O.......................................................................................................50

10.1 Using a GPIO pad as INPUT.............................................................................................50

10.2 Using a GPIO pad as OUTPUT.........................................................................................50

10.3 Using the Alarm Output GPIO_06/ALARM......................................................................51

10.4 Using the Buzzer Output GPIO_07/BUZZER...................................................................51

11 Camera ............................................................................................................................52

11.1 Camera characteristics ....................................................................................................52

11.1.1 Camera interface connectors......................................................................................................... 52

11.1.2............................................................................................................................................................. 53

11.1.3............................................................................................................................................................. 53

11.1.4............................................................................................................................................................. 53

11.1.5 EVB for Transchip camera support ............................................................................................... 54

11.1.6 Example usage script for camera .................................................................................................. 55

12 Conformity Assessment Issues....................................................................................56

13 SAFETY RECOMMANDATIONS.....................................................................................57

14 Document Change Log ..................................................................................................58

Annex A – EVK2 schematics ...............................................................................................59

Annex B - Camera EVB schematics ....................................................................................65

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

1 Overview

The aim of this document is the description of some hardware solutions useful for developing a product with the

Telit GC864 module.

In this document all the basic functions of a mobile phone will be taken into account; for each one of them a

proper hardware solution will be suggested and eventually the wrong solutions and common errors to be

avoided will be evidenced. Obviously this document can not embrace the whole hardware solutions and

products that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the

suggested hardware configurations shall not be considered mandatory, instead the information given shall be

used as a guide and a starting point for properly developing your product with the Telit GC864 module. For

further hardware details that may not be explained in this document refer to the Telit GC864 Product Description

document where all the hardware information is reported.

NOTICE

(EN) The integration of the GC864 GSM/GPRS cellular module within user application shall be

done according to the design rules described in this manual.

(IT) L’integrazione del modulo cellulare GSM/GPRS GC864 all’interno dell’applicazione

dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.

(DE) Die Integration des GC864 GSM/GPRS Mobilfunk-Moduls in ein Gerät muß gemäß der in

diesem Dokument beschriebenen Konstruktionsregeln erfolgen

(SL) Integracija GSM/GPRS GC864 modula v uporabniški aplikaciji bo morala upoštevati

projektna navodila, opisana v tem priročniku.

(SP) La utilización del modulo GSM/GPRS GC864 debe ser conforme a los usos para los

cuales ha sido diseñado descritos en este manual del usuario

(FR) L'intégration du module cellulaire GC864 GSM/GPRS dans l'application de l'utilisateur

sera faite selon les règles de conception décrites dans ce manuel

(HE)

The information presented in this document is believed to be accurate and reliable. However, Telit

Communication assumes no responsibility for its use, nor any infringement of patents or other rights of third

parties which may result from its use. No license is granted by implication or otherwise under any patent rights of

Telit Communication other than for circuitry embodied in Telit products. This document is subject to change

without notice.

GC864 Hardware User Guide

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2 Hardware Commands

2.1 Turning ON the GC864

To turn on the GC864 the pad ON# must be tied low for at least 1 second and then released.

The maximum current that can be drained from the ON# pad is 0,1 mA.

A simple circuit to do it is:

NOTE: don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up

resistor may bring to latch up problems on the GC864 power regulator and improper power

on/off of the module. The line ON# must be connected only in open collector configuration.

NOTE: In this document all the lines that are inverted, hence have active low signals are

labeled with a name that ends with a "#" or with a bar over the name.

NOTE: The GC864 turns fully on also by supplying power to the Charge pad (provided there's

a battery on the VBATT pads).

ON#

Power ON impulse

GND

R1

R2

Q1

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For example:

1- Let's assume you need to drive the ON# pad with a totem pole output of a +3/5 V microcontroller

(uP_OUT1):

2- Let's assume you need to drive the ON# pad directly with an ON/OFF button:

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2.2 Turning OFF the GC864

The turning off of the device can be done in three ways:

• by software command (see GC864 Software User Guide)

• by hardware shutdown

When the device is shut down by software command or by hardware shutdown, it issues to the

network a detach request that informs the network that the device will not be reachable any more.

2.2.1 Hardware shutdown

To turn OFF the GC864 the pad ON# must be tied low for at least 1 second and then released.

The same circuitry and timing for the power on shall be used.

The device shuts down after the release of the ON# pad.

TIP: To check if the device has powered off, the hardware line PWRCTL should be monitored.

When PWRCTL goes low, the device has powered off.

2.3 Hardware Unconditional Reboot

To unconditionally Reboot the GC864, the pad RESET# must be tied low for at least 200 milliseconds

and then released.

The maximum current that can be drained from the ON# pad is 0,15 mA.

A simple circuit to do it is:

NOTE: don't use any pull up resistor on the RESET# line nor any totem pole digital output.

Using pull up resistor may bring to latch up problems on the GC864 power regulator and

improper functioning of the module. The line RESET# must be connected only in open

collector configuration.

RESET#

Unconditional Reboot

impulse

GND

GC864 Hardware User Guide

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TIP: The unconditional hardware reboot should be always implemented on the boards and

software should use it as an emergency exit procedure.

For example:

1- Let's assume you need to drive the RESET# pad with a totem pole output of a +3/5 V

microcontroller (uP_OUT2):

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3 Power Supply

The power supply circuitry and board layout are a very important part in the full product design and

they strongly reflect on the product overall performances, hence read carefully the requirements and

the guidelines that will follow for a proper design.

3.1 Power Supply Requirements

The GC864 power requirements are:

• Nominal Supply Voltage: 3.8 V

• Max Supply Voltage: 4.2 V

• Supply voltage range: 3.4 V - 4.2 V

• Max Peak current consumption (impulsive): 1.9 A

• Max Average current consumption during GPRS transmission (rms): 500 mA

• Max Average current consumption during VOICE/CSD transmission (rms): 270 mA

• Average current during Power Saving: ≈ 4 mA

• Average current during idle (Power Saving disabled) ≈ 19 mA

The GSM system is made in a way that the RF transmission is not continuous, else it is packed into

bursts at a base frequency of about 216 Hz, the relative current peaks can be as high as about 2A.

Therefore the power supply has to be designed in order to withstand with these current peaks without

big voltage drops; this means that both the electrical design and the board layout must be designed for

this current flow.

If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the

supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the

voltage drop during the peak current absorption is too much, then the device may even shutdown as a

consequence of the supply voltage drop.

TIP: The electrical design for the Power supply should be made ensuring it will be capable of a

peak current output of at least 2 A.

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3.2 General Design Rules

The principal guidelines for the Power Supply Design embrace three different design steps:

- the electrical design

- the thermal design.

- the PCB layout.

3.2.1 Electrical design Guidelines

The electrical design of the power supply depends strongly from the power source where this power is

drained. We will distinguish them into three categories:

• +5V input (typically PC internal regulator output)

• +12V input (typically automotive)

• Battery

3.2.1.1 + 5V input Source Power Supply Design Guidelines

• The desired output for the power supply is 3.8V, hence there's not a big difference between the

input source and the desired output and a linear regulator can be used. A switching power supply

will not be suited because of the low drop out requirements.

• When using a linear regulator, a proper heat sink shall be provided in order to dissipate the power

generated.

• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks close to the GC864, a 100μF tantalum capacitor is usually suited.

• Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at

least 10V.

• A protection diode should be inserted close to the power input, in order to save the GC864 from

power polarity inversion.

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An example of linear regulator with 5V input is:

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3.2.1.2 + 12V input Source Power Supply Design Guidelines

• The desired output for the power supply is 3.8V, hence due to the big difference between the input

source and the desired output, a linear regulator is not suited and shall not be used. A switching

power supply will be preferable because of its better efficiency especially with the 2A peak current

load represented by the GC864.

• When using a switching regulator, a 500kHz or more switching frequency regulator is preferable

because of its smaller inductor size and its faster transient response. This allows the regulator to

respond quickly to the current peaks absorption.

• For car PB battery the input voltage can rise up to 15,8V and this should be kept in mind when

choosing components: all components in the power supply must withstand this voltage.

• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks, a 100μF tantalum capacitor is usually suited.

• Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at

least 10V.

• For Car applications a spike protection diode should be inserted close to the power input, in order

to clean the supply from spikes.

• A protection diode should be inserted close to the power input, in order to save the GC864 from

power polarity inversion. This can be the same diode as for spike protection.

An example of switching regulator with 12V input is:

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3.2.1.3 Battery Source Power Supply Design Guidelines

• The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is

4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit

GC864 module.

The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE USED

DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the

GC864 and damage it.

NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GC864.

Their use can lead to overvoltage on the GC864 and damage it. USE ONLY Li-Ion battery types.

• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks, a 100μF tantalum capacitor is usually suited.

• Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.

• A protection diode should be inserted close to the power input, in order to save the GC864 from

power polarity inversion. Otherwise the battery connector should be done in a way to avoid polarity

inversions when connecting the battery.

• The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A; the

suggested capacity is from 500mAh to 1000mAh.

3.2.1.4 Battery Charge control Circuitry Design Guidelines

The charging process for Li-Ion Batteries can be divided into 4 phases:

• Qualification and trickle charging

• Fast charge 1 - constant current

• Final charge - constant voltage or pulsed charging

• Maintenance charge

The qualification process consists in a battery voltage measure, indicating roughly its charge status. If

the battery is deeply discharged, that means its voltage is lower than the trickle charging threshold,

then the charge must start slowly possibly with a current limited pre-charging process where the

current is kept very low with respect to the fast charge value: the trickle charging.

During the trickle charging the voltage across the battery terminals rises; when it reaches the fast

charge threshold level the charging process goes into fast charge phase.

During the fast charge phase the process proceeds with a current limited charging; this current limit

depends on the required time for the complete charge and from the battery pack capacity. During this

phase the voltage across the battery terminals still raises but at a lower rate.

Once the battery voltage reaches its maximum voltage then the process goes into its third state: Final

charging. The voltage measure to change the process status into final charge is very important. It

must be ensured that the maximum battery voltage is never exceeded, otherwise the battery may be

damaged and even explode. Moreover for the constant voltage final chargers, the constant voltage

phase (final charge) must not start before the battery voltage has reached its maximum value,

otherwise the battery capacity will be highly reduced.

The final charge can be of two different types: constant voltage or pulsed. GC864 uses constant

voltage.

The constant voltage charge proceeds with a fixed voltage regulator (very accurately set to the

maximum battery voltage) and hence the current will decrease while the battery is becoming charged.

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When the charging current falls below a certain fraction of the fast charge current value, then the

battery is considered fully charged, the final charge stops and eventually starts the maintenance.

The pulsed charge process has no voltage regulation, instead the charge continues with pulses.

Usually the pulse charge works in the following manner: the charge is stopped for some time, let's say

few hundreds of ms, then the battery voltage will be measured and when it drops below its maximum

value a fixed time length charging pulse is issued. As the battery approaches its full charge the off

time will become longer, hence the duty-cycle of the pulses will decrease. The battery is considered

fully charged when the pulse duty-cycle is less than a threshold value, typically 10%, the pulse charge

stops and eventually the maintenance starts.

The last phase is not properly a charging phase, since the battery at this point is fully charged and the

process may stop after the final charge. The maintenance charge provides an additional charging

process to compensate for the charge leak typical of a Li-Ion battery. It is done by issuing pulses with

a fixed time length, again few hundreds of ms, and a duty-cycle around 5% or less.

This last phase is not implemented in the GC864 internal charging algorithm, so that the battery once

charged is left discharging down to a certain threshold so that it is cycled from full charge to slight

discharge even if the battery charger is always inserted. This guarantees that anyway the remaining

charge in the battery is a good percentage and that the battery is not damaged by keeping it always

fully charged (Li-Ion rechargeable battery usually deteriorate when kept fully charged).

Last but not least, in some applications it is highly desired that the charging process restarts when the

battery is discharged and its voltage drops below a certain threshold, GC864 internal charger does it.

As you can see, the charging process is not a trivial task to be done; moreover all these operations

should start only if battery temperature is inside a charging range, usually 5°C - 45°C.

The GC864 measures the temperature of its internal component, in order to satisfy this last

requirement, it's not exactly the same as the battery temperature but in common application the two

temperature should not differ too much and the charging temperature range should be guaranteed.

NOTE: For all the threshold voltages, inside the GC864 all threshold are fixed in order to

maximize Li-Ion battery performances and do not need to be changed.

NOTE: In this application the battery charger input current must be limited to less than 400mA.

This can be done by using a current limited wall adapter as the power source.

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3.2.2 Thermal Design Guidelines

The thermal design for the power supply heat sink should be done with the following specifications:

• Average current consumption during transmission @PWR level max (rms): 500mA

• Average current consumption during transmission @ PWR level min (rms): 100mA

• Average current during Power Saving: 4mA

• Average current during idle (Power Saving disabled) 19mA

NOTE: The average consumption during transmissions depends on the power level at which

the device is requested to transmit by the network. The average current consumption hence

varies significantly.

TIP: The thermal design for the Power supply should be made keeping a average consumption

at the max transmitting level during calls of 500mA rms.

Considering the very low current during idle, especially if Power Saving function is enabled, it is

possible to consider from the thermal point of view that the device absorbs current significantly only

during calls.

If we assume that the device stays into transmission for short periods of time (let's say few minutes)

and then remains for a quite long time in idle (let's say one hour), then the power supply has always

the time to cool down between the calls and the heat sink could be smaller than the calculated one for

500mA maximum RMS current, or even could be the simple chip package (no heat sink).

Moreover in the average network conditions the device is requested to transmit at a lower power level

than the maximum and hence the current consumption will be less than the 500mA, being usually

around 150mA.

For these reasons the thermal design is rarely a concern and the simple ground plane where the

power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating.

For the heat generated by the GC864, you can consider it to be during transmission 1W max during

CSD/VOICE calls and 2W max during class10 GPRS upload.

This generated heat will be mostly conducted to the ground plane under the GC864, you must ensure

that your application can dissipate it.

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3.2.3 Power Supply PCB layout Guidelines

As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the

output to cut the current peaks and a protection diode on the input to protect the supply from spikes

and polarity inversion. The placement of these components is crucial for the correct working of the

circuitry. A misplaced component can be useless or can even decrease the power supply

performances.

• The Bypass low ESR capacitor must be placed close to the Telit GC864 power input pads or in the

case the power supply is a switching type it can be placed close to the inductor to cut the ripple

provided the PCB trace from the capacitor to the GC864 is wide enough to ensure a dropless

connection even during the 2A current peaks.

• The protection diode must be placed close to the input connector where the power source is

drained.

• The PCB traces from the input connector to the power regulator IC must be wide enough to ensure

no voltage drops occur when the 2A current peaks are absorbed. Note that this is not made in

order to save power loss but especially to avoid the voltage drops on the power line at the current

peaks frequency of 216 Hz that will reflect on all the components connected to that supply,

introducing the noise floor at the burst base frequency. For this reason while a voltage drop of 300-

400 mV may be acceptable from the power loss point of view, the same voltage drop may not be

acceptable from the noise point of view. If your application doesn't have audio interface but only

uses the data feature of the Telit GC864, then this noise is not so disturbing and power supply

layout design can be more forgiving.

• The PCB traces to the GC864 and the Bypass capacitor must be wide enough to ensure no

significant voltage drops occur when the 2A current peaks are absorbed. This is for the same

reason as previous point. Try to keep this trace as short as possible.

• The PCB traces connecting the Switching output to the inductor and the switching diode must be

kept as short as possible by placing the inductor and the diode very close to the power switching

IC (only for switching power supply). This is done in order to reduce the radiated field (noise) at the

switching frequency (100-500 kHz usually).

• The use of a good common ground plane is suggested.

• The placement of the power supply on the board should be done in such a way to guarantee that

the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry

as the microphone amplifier/buffer or earphone amplifier.

• The power supply input cables should be kept separate from noise sensitive lines such as

microphone/earphone cables.

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4 Antenna

The antenna connection and board layout design are the most important part in the full product design

and they strongly reflect on the product overall performances, hence read carefully and follow the

requirements and the guidelines for a proper design.

4.1 Antenna Requirements

As suggested on the Product Description the antenna for a Telit GC864 device shall fulfill the following

requirements:

ANTENNA REQUIREMENTS

Frequency range

Standard Dual Band GSM/DCS frequency

range or

Standard Tri Band GSM/DCS/PCS

frequency range if used for all three bands

Bandwidth

136 MHz in GSM 850 and 900 & 170 MHz in

DCS & 140 MHz PCS band

Gain

Gain < 3dBi

Impedance

50 ohm

Input power

> 2 W peak power

VSWR absolute

max

<= 10:1

VSWR

recommended

<= 2:1

4.2 GC864 Antenna Connector

The GC864 module is equipped with a 50 Ohm RF connector from Murata,

GSC type P/N MM9329-2700B.

The counterpart suitable is Murata MXTK92 Type or MXTK88 Type.

Moreover, the GC864 has the antenna pads on the backside of the PCB. This allows the manual

soldering of the coaxial cable directly on the back side of the PCB. However, the soldering is not an

advisable solution for a reliable connection of the antenna.

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4.3 Antenna installation Guidelines

• Install the antenna in a place covered by the GSM signal.

• The Antenna must be installed to provide a separation distance of at least 20 cm from all persons

and must not be co-located or operating in conjunction with any other antenna or transmitter;

• Antenna shall not be installed inside metal cases

• Antenna shall be installed also according Antenna manufacturer instructions.

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5 GC864 pins allocation

The GC864 uses an 80 pin Molex p.n. 53949-0878 male connector for the connections with the external

applications. This connector matches the 54150-0878 model

.

Pin Signal I/O Function Internal

Pull up

Type

Power Supply

1 VBATT - Main power supply Power

2 VBATT - Main power supply Power

3 VBATT - Main power supply Power

4 VBATT - Main power supply Power

5 GND - Ground Power

6 GND - Ground Power

7 GND - Ground Power

Audio

8 AXE I Handsfree switching

100K

Ω

CMOS 2.8V

9 EAR_HF+ AO Handsfree ear output, phase + Audio

10 EAR_HF- AO Handsfree ear output, phase - Audio

11 EAR_MT+ AO Handset earphone signal output, phase + Audio

12 EAR_MT- AO Handset earphone signal output, phase - Audio

13 MIC_HF+ AI Handsfree microphone input; phase +, nominal level 3mVrms Audio

14 MIC_HF- AI Handsfree microphone input; phase -, nominal level 3mVrms Audio

15 MIC_MT+ AI Handset microphone signal input; phase+, nominal level 50mVrms Audio

16 MIC_MT- AI Handset microphone signal input; phase-, nominal level 50mVrms Audio

SIM Card Interface

18 SIMVCC - External SIM signal – Power supply for the SIM 1.8/3V

19 SIMRST O External SIM signal – Reset 1.8/3V

20 SIMIO I/O External SIM signal - Data I/O 1.8/3V

21 SIMIN I External SIM signal - Presence (active low)

47K

Ω

1.8/3V

22 SIMCLK O External SIM signal – Clock 1.8/3V

Trace

23 RX_TRACE I RX Data for debug monitor CMOS 2.8V

24 TX_TRACE O TX Data for debug monitor CMOS 2.8V

Prog. / Data + Hw Flow Control

25 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V

26 C104/RXD O Serial data output to DTE CMOS 2.8V

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Pin Signal I/O Function Internal

Pull up

Type

27 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V

28 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V

29 C108/DTR I Input for Data terminal ready signal (DTR) from DTE CMOS 2.8V

30 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V

31 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V

32 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V

IIC

35 CAM_SCL /

IIC_SCL

I/O Camera IIC interface / Configurable GPIO CMOS 2.8V

36 CAM_SDA /

IIC_SDA

I/O Camera IIC interface / Configurable GPIO CMOS 2.8V

DAC and ADC

37 ADC_IN1 AI Analog/Digital converter input A/D

38 ADC_IN2 AI Analog/Digital converter input A/D

39 ADC_IN3 AI Analog/Digital converter input A/D

40 DAC_OUT AO Digital/Analog converter output D/A

Miscellaneous Functions

44 MON1_CAM I/O MON1 / Camera interface CMOS 2.8V

45 STAT_LED O Status indicator led CMOS 1.8V

46 GND - Ground Ground

49 PWRMON I Power ON Monitor CMOS 2.8V

50 VAUX1 - Power output for external accessories -

51 CHARGE AI Charger input (*) Power

52 CHARGE AI Charger input (*) Power

53 ON/OFF* I Input command for switching power ON or OFF (toggle command).

The pulse to be sent to the GC864 must be equal or greater than 1

second.

47K

Ω

Pull up to VBATT

54 RESET* I Reset input

55 VRTC AO VRTC Backup capacitor Power

Telit GPIO

56 TGPIO_19 I/O Telit GPIO19 Configurable GPIO CMOS 2.8V

57 TGPIO_11 I/O Telit GPIO11 Configurable GPIO CMOS 2.8V

58 TGPIO_20 I/O Telit GPIO20 Configurable GPIO CMOS 2.8V

59 TGPIO_04 I/O Telit GPIO4 Configurable GPIO CMOS 2.8V

60 TGPIO_14 I/O Telit GPIO14 Configurable GPIO CMOS 2.8V

61 TGPIO_15 I/O Telit GPIO15 GPIO pin CMOS 2.8V

62 TGPIO_12 I/O Telit GPIO12 Configurable GPIO CMOS 2.8V

63 TGPIO_10 I/O Telit GPIO10 I/O pin CMOS 2.8V

64 TGPIO_22 I/O Telit GPIO22 Configurable GPIO CMOS 1.8V

65 TGPIO_18 I/O Telit GPIO18 I/O pin CMOS 2.8V

66 TGPIO_03 I/O Telit GPIO3 Configurable GPIO CMOS 2.8V

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Telit Wireless Solutions GC864-QUAD Hardware User's Manual

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